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Goodwill and intangible assets - Schedule of Goodwill (Details) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2016 | Feb. 29, 2016 | Dec. 15, 2015 | Jul. 01, 2014 | Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Changes in goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  | $ 376,302,000 | $ 170,626,000
Goodwill, acquired during period |  |  |  |  |  | 21,453,000 |
Foreign currency translation |  |  |  |  |  | (7,597,000) | (8,649,000)
Balance at the end of the period |  |  |  |  | $ 397,558,000 | 397,558,000 | 376,302,000
Impairment of goodwill related to continuing operations | $ 0 |  |  | $ 0 |  | 0 | 0
Acentia |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Goodwill, acquired during period |  |  |  |  | 221,949,000 |  | 214,325,000
Adjustment to goodwill acquired |  |  |  |  |  | 7,624,000 |
Ascend Management Innovations LLC |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Goodwill, acquired during period |  | $ 18,554,000 |  |  |  |  |
Health Services |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  | 113,427,000 | 118,721,000
Foreign currency translation |  |  |  |  |  | (8,302,000) | (5,294,000)
Balance at the end of the period |  |  |  |  | 123,679,000 | 123,679,000 | 113,427,000
Health Services | Acentia |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Goodwill, acquired during period |  |  |  |  |  |  | 0
Adjustment to goodwill acquired |  |  |  |  |  | 0 |
Health Services | Ascend Management Innovations LLC |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Goodwill, acquired during period |  |  |  |  |  | 18,554,000 |
U.S. Federal Services |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  | 220,524,000 | 6,199,000
Foreign currency translation |  |  |  |  |  | 0 |
Balance at the end of the period |  |  |  |  | 228,148,000 | 228,148,000 | 220,524,000
U.S. Federal Services | Acentia |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Goodwill, acquired during period |  |  |  |  |  |  | 214,325,000
Adjustment to goodwill acquired |  |  |  |  |  | 7,624,000 |
Human Services |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  | 42,351,000 | 45,706,000
Foreign currency translation |  |  |  |  |  | 705,000 | (3,355,000)
Balance at the end of the period |  |  |  |  | $ 45,731,000 | 45,731,000 | $ 42,351,000
Human Services | Acentia |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Adjustment to goodwill acquired |  |  |  |  |  | 0 |
Human Services | Assessments Australia |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Goodwill, acquired during period |  |  | $ 2,900,000 |  |  | 2,899,000 |
K-12 Education |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Disposal of K-12 Education business |  |  |  |  |  | (224,000) |
K-12 Education | U.S. Federal Services |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Disposal of K-12 Education business |  |  |  |  |  | 0 |
K-12 Education | Human Services |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |
Disposal of K-12 Education business |  |  |  |  |  | $ (224,000) |

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